I logged on yesterday to grind my non-elite tanks, when I got to my T10 I noticed that my earned XP seemed to be missing some (like about 40k). I remember I was about 180k because I was excited that I was going to pass the 200k mark and won’t have to grind long to unlock the 277 when it gets released.

So for any of you grinding tanks like the T10, keep an eye on your XP.